The Levelflex is a "downward-looking" measuring system that functions according to the ToF method
(ToF = Time of Flight). The distance from the reference point to the product surface is measured.
High-frequency pulses are injected to a probe and led along the probe. The pulses are reflected by
the product surface, received by the electronic evaluation unit and converted into level information.
This method is also known as TDR (Time Domain Reflectometry).